Cylinder-liner pulling tools

ABSTRACT

A pull rod, having a tiltable foot member at its lower extremity and an actuating nut as its upper extremity, and provided with a detachable support assembly. The pull rod is inserted in a cylinder liner and the foot member is turned and placed in contact with the lower extremity of a cylinder liner. The support member is placed on an engine block to support the actuating nut over the cylinder liner and the actuating nut is power rotated to draw the foot member and the cylinder liner upwardly from the block.

United States Patent Layne 1 CYLINDER-LINER PULLING TOOLS [72] inventor: Arnold B. Layne, Aurora, C010.

[73] Assignee: B. K. Sweeney Manufacuring Co.,

Denver, C010.

[22] Filed: Dec. 23, 1970 [21] Appl.No.: 101,008

[52] US. Cl ..29/266, 29/255 [51] Int. Cl. ..B23p 19/04 [58] Field of Search ..29/255, 258, 259, 260, 261,

[56] Reierences Cited UNITED STATES PATENTS 2,318,980 5/1943 White ..29/262 3,089,229 5/1963 Brodie ..29/261 2,568,998 9/1951 Fletcher ..29/266 341,146 5/1886 l-lowes ..85/32 R [451 Sept. 19, 1972 2,913,817 11/1959 Barre et al. ..29/266 X FOREIGN PATENTS OR APPLICATIONS 362,166 12/1931 Great Britain ..85/5 B Primary Examiner-Andrew R. Juhasz Assistant Examiner-J. C. Peters AttorneyR. l-l. Galbreath [5 7] ABSTRACT A pull rod, having a tiltable foot member at its lower extremity and an actuating nut as its upper extremity, and provided with a detachable support assembly. The pull rod is inserted in a cylinder liner and the foot member is turned and placed in contact with the lower extremity of a cylinder liner. The support member is placed on an engine block to support the actuating nut over the cylinder liner and the actuating nut is power rotated to draw the foot member and the cylinder liner upwardly from the block.

10 Claims, 6 Drawing Figures CYLINDER-LINER PULLING TOOLS In certain types of internal-combustion engines, the cylinders are bored to receive cylindrical cylinder liners which can be removed for replacement or repair without the necessity of reboring the engine block. The cylinder liners are usually supplied with annular packing rings and are installed with a press fit in the cylinder bores. After long use, the outside diameter of the liners will tend to build up from external corrosion, and the packing rings will become fixedly attached to the walls of the bores, so that it becomes exceedingly difficult, especially in view of the close tolerances of working space available, to loosen and separate the liners from the block for replacement or repair.

The principal object of this invention is to provide a relatively simple and highly efficient cylinder liner pulling tool which can be quickly and easily placed in position in an adhering cylinder liner and actuated by a conventional pneumatic impact wrench to rapidly loosen the liner from the engine block.

A further object is to so construct the tool that it can be readily assembled when in place in the cylinder liner so as to avoid the space, weight and time usually required for pre-assembly of a liner pulling tool and so as to accurately receive and retain the tool elements in place for the final motor driven pulling impact.

A still further object is to so construct the tool that the possibility of injury by loose elements during power loading and unloading of the liner will be reduced.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy and efficiency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is made to the accompanying drawings which form a part hereof. Like numerals refer to like parts in all views of the drawings and throughout the description.

In the drawings:

FIG. 1 is a front elevational view of the improved cylinder liner pulling tool of this invention showing in broken line the relative positions of an engineblock and a conventional liner to which the pulling tool is aplied;

p FIG. 2 is' a similar side elevational view thereof;

FIG. 3 is a vertical longitudinal section, partly in elevation, taken on the line 3--3, FIG. 1;

FIG. 4 is a horizontal cross section looking downwardly on the line 4-4, FIG. 1;

FIG. 5 is a similar cross section looking downwardly on the line 5--5, FIG. 1; and

FIG. 6 is a detail fragmentary section taken on the line 6-6, FIG. 3.

In FIG. 1 the position of the head-engaging face of an engine block is indicated by the broken line A; the position of a cylinder bore therein is indicated by the broken lines B; and the position. of a cylinder-liner therein is similarly indicated at C.

The invention employs two detachable assembliesa support assembly and a pulling assembly.

The support assembly comprises two radially positioned frame bars 10 extending equally and oppositely outward from a cylindrical vertically positioned split guide sleeve 11 and provided with terminal supporting legs 12 at their distant extremities. The legs 12 are straight metallic strips welded, or otherwise fixedly secured, to the extremities of the frame bars and extend vertically downward therefrom so that when in use the split sleeve 11 will be vertically spaced above the face A of the engine block. The guide sleeve 11 is provided with a vertical semi-cylindrical bearing opening 13 one side of which is vertically cut away to leave a vertical open passage 14in the sleeve 11 of a width slightly in excess of the diameter of the bearing opening 13. The bearing opening 13 is also provided with an upper counterbore 15 to receive a bearing washer 19 which is fixedly mounted on the lower extremity of an elongated actuating nut 17.

The pulling assembly employs a round, elongated pull rod 16, upon the upper extremity of which the nut 17 is threaded, having a tiltable foot member 18 at its lower extremity. The length of the pull rod will be determined from the size and type of the cylinders to be worked upon.

The upper extremity of the rod 16 is reduced in diameter to provide a terminal portion 20 and the rod is provided with external threads 21 below the terminal portion 20. The lower extremity of the rod terminates in a hinge block 22, having opposite flat sides, which is welded or otherwise permanently formed thereon.

The actuating nut 17 is preferably hexagonal and is provided, adjacent its lower extremity, with a set of intemal threads 23 which intermesh with the external threads 21 on the pull rod 16. The upper portion of the elongated nut 17 is counterbored above the set of threads 23 to form a cylindrical clearance cavity 24 about the upper extremity of the rod. The terminal portion 20 of the pull rod 16 is provided with a diametrically positioned roll pin 25, of a length substantially equal to the internal diameter of the clearance cavity 24, against which the set of internal threads 23 will contact to prevent complete withdrawal and loss of the actuating nut 17. The terminal portion 20 and the internal threads 23 are so spaced that when the roll pin 25 is in contact with the threads 23 the pull rod will be completely unscrewed from the threads 23 so that the nut 17 will be freely rotatably in either direction.

The tiltable foot member 18 is formed with two parallel, upwardly-extending, triangular side plates 26 and 27, which rotatably engage the flat sides of the hinge block 22. A removable hinge pin 28 extends laterally through the side plates 26 and 27 and through the hinge block 22 to pivotally mount the foot member on the block. The hinge pin 28 is provided with an enlarged head 29 at its one extremity and with a diametrically positioned, spring-loaded click ball or latch 30 adjacent its other extremity to detachably latch the hinge pin in place. The foot member can be rotated between a horizontal solid line position and a vertical broken line position as shown in FIG. 6.

Each of the opposite extremities of the foot member 18 is concentrically formed as indicated in FIG. 5 to provide: an arcuate cylinder-entering edge 33; an arcuate liner-entering edge34 and an arcuate liner-supporting ledge 35 thereon. The oppositely inclined upper edges on the side plates serve to guide the liner-supporting ledges 35 into concentrically aligned contact with the cylinder liner C as the foot member is drawn upwardly in a cylinder. The bottoms of the cylinder-entering edges 34 are preferably upwardly inclined as shown at 36 to facilitate entry in the engine cylinder.

OPERATION It is believed that operation of the improved tool will become apparent from the above description of the elements involved. Briefly, the pull rod 16, with the footmember in a substantially vertical position, is inserted downwardly in the cylinder liner C to a position in the crankcase below the liner. The foot member then gravitates to the horizontal position, or solid line position of FIG. 6, and the pull rod is drawn upwardly. The inclined upper edges of the side plates 26 and 27 will then contact the lower edge of the liner and automatically align the supporting ledge 35 of the foot member against the annular bottom edge of the liner.

The support assembly is then placed over the cylinder, supported by the legs 12, and the split sleeve 1 l is swung into surrounding engagement with the pull rod below the actuating nut 17 with the bearing washer 19 in the counterbore to retain the rod 16 in place on the support assembly. The actuating nut is now manually rotated to draw the foot member upward into contact with the liner, as shown in FIG. 1.

The socket 37 of a power wrench 38, preferably a conventional pneumatic impact wrench, is now placed over the upper extremity of the actuating nut 17 and is actuated to cause the coacting threads 21 and 23 to draw the pull rod upwardly to loosen and lift the liner from the engine cylinder as indicated in FIG. 1. The loosened liner can then be readily removed such as by simply lifting the pulling tool axially upward from the cylinder or in any other desired manner.

The diameters of the entering edges 33 and 34 of the foot members will vary in accordance with the cylinder diameters encountered in use. However, foot members of various diameters can be quickly interchanged by simply pushing the hinge pin 28 from place, against the bias of the click ball 30.

Since the engine block may be in any convenient position and since the improved cylinder-liner pulling tool is readily portable, the words upward, downward, horizontal, vertical, top, bottom, and words of like import are for description of the illustrations on the drawing only.

While a selected form of the invention has been above described, it is understood that mechanical variations and detail substitutions can be made by one skilled in the art without departing from the spirit of the invention.

Having thus described the invention what is claimed and desired to be secured by Letters Patent is:

1. A tool for pulling a cylinder liner from an engine cylinder comprising:

a. an elongated, threaded pull rod adapted to be inserted downwardly in said liner;

. an actuating nut threaded upon the upper portion of said pull rod;

c. a cylindrical guide sleeve in which said pull rod is slidable, surrounding said pull rod below said actuating nut;

. means for stationarily supporting said guide sleeve above and concentric with the engine cylinder;

e. an elongaged foot member pivotally mounted on the lower extremity of said pull rod adapted to extend diametrically across and engage the lower extremity of said cylinder liner, said foot member including substantially triangular side plates, the upper edges of which are inclined outwardly and downwardly defining guide means for centering the foot member with respect to said cylinder liner, and

f. means for rotating said actuating nut on said pull rod to cause the latter to draw said foot member upwardly so as to pull said liner from said cylinder.

A tool as described in claim 1 having:

an elongated open passage in the side of said guide sleeve into which said pull rod may be laterally swung to an axial position relative to said actuating nut. 3. A tool as described in claim 2 in which the means for stationarily supporting said guide sleeve comprises:

a. frame bars extending oppositely outward from said guide sleeve; and b. a supporting leg extending downwardly from the outer extremity of each frame bar so as to support said guide sleeve in axially spaced relation with, and concentrically over, the engine cylinder.

. A tool as described in claim 1 having:

. a set of internal threads in the lower extremity of said actuating nut in mesh with the pull rod threads, the upper extremity of said actuating nut being internally unthreaded so as to provide a clearance cavity about and normally above the upper extremity of said rod.

. A tool as described in claim 4 provided with:

. a diametrically positioned stop pin extending through the upper extremity of the pull rod within said cavity and adapted to be contacted by the set of internal threads on said actuating nut to limit the upward movement of said actuating nut on said rod.

A tool as described in claim 5 having:

. a bearing washer mounted on the lower extremity of said actuating nut and adapted to rotatably contact the upper extremity of said guide sleeve to receive the axial pressure between said nut and said sleeve.

7. A tool as described in claim 1 in which the pivotal mounting comprises:

a. a hinge block positioned on the lower extremity of said pull rod;

b. substantially triangular side plates formed on opposite sides of said foot member and rotatably positioned on opposite sides of said hinge block; and

c. a hinge pin extending through said hinge block and through said side plates upon which said foot member is rotatably mounted.

8. A tool as described in claim 7 having:

a. a head formed on one extremity of said hinge pin;

and

b. spring-pressed latch member resiliently projecting from said hinge pin adjacent its other extremity to releasably maintain said hinge pin in operative position.

9. A tool as described in claim 1 having:

a. an arcuate ledge on each extremity of said foot member, said ledges adapted to fit against and circumferentially align with the lower extremity of said cylinder-liner when the latter is in place in an engine cylinder.

10. A tool as described in claim 6 in which:

a. said bearing washer is fixedly mounted on the lower extremity of said actuating nut; and having b. a counterbore in the upper extremity of said guide sleeve into which said bearing washer is rotatably mounted to retain said actuating nut in axial alignment with said guide sleeve.

* a: a: it 5 

1. A tool for pulling a cylinder liner from an engine cylinder comprising: a. an elongated, threaded pull rod adapted to be inserted downwardly in said liner; b. an actuating nut threaded upon the upper portion of said pull rod; c. a cylindrical guide sleeve in which said pull rod is slidable, surrounding said pull rod below said actuating nut; d. means for stationarily supporting said guide sleeve above and concentric with the engine cylinder; e. an elongaged foot member pivotally mounted on the lower extremity of said pull rod adapted to extend diametrically across and engage the lower extremity of said cylinder liner, said foot member including substantially triangular side plates, the upper edges of which are inclined outwardly and downwardly defining guide means for centering the foot member with respect to said cylinder liner, and f. means for rotating said actuating nut on said pull rod to cause the latter to draw said foot member upwardly so as to pull said liner from said cylinder.
 2. A tool as described in claim 1 having: a. an elongated open passage in the side of said guide sleeve into which said pull rod may be laterally swung to an axial position relative to said actuating nut.
 3. A tool as described in claim 2 in which the means for stationarily supporting said guide sleeve comprises: a. frame bars extending oppositely outward from said guide sleeve; and b. a supporting leg extending downwardly from the outer extremity of each frame bar so as to support said guide sleeve in axially spaced relation with, and concentrically over, the engine cylinder.
 4. A tool as described in claim 1 having: a. a set of internal threads in the lower extremity of said actuating nut in mesh with the pull rod threads, the upper extremity of said actuating nut being internally unthreaded so as to provide a clearance cavity about and normally above the upper extremity of said rod.
 5. A tool as described in claim 4 provided with: a. a diametrically positioned stop pin extending through the upper extremity of the pull rod within said cavity and adapted to be contacted by the set of internal threads on said actuating nut to limit the upward movement of said actuating nut on said rod.
 6. A tool as described in claim 5 having: a. a bearing washer mounted on the lower extremity of said actuating nut and adapted to rotatably contact the upper extremity of said guide sleeve to receive the axial pressure between said nut and said sleeve.
 7. A tool as described in claim 1 in which the pivotal mounting comprises: a. a hinge block positioned on the lower extremity of said pull rod; b. substantially triangular side plates formed on opposite sides of said foot member and rotatably positioned on opposite sides of said hinge block; and c. a hinge pin extending through said hinge block and through said side plates upon which said foot member is rotatably mounted.
 8. A tool as described in claim 7 having: a. a head formed on one extremity of said hinge pin; and b. spring-pressed latch member resiliently projecting from said hinge pin adjacent its other extremity to releasably maintain said hinge pin in operative position.
 9. A tool as described in claim 1 having: a. an arcuate ledge on each extremity of said foot member, said ledges adapted to fit against and circumferentially align with the lower extremity of said cylinder-liner when the latter is in place in an engine cylinder.
 10. A tool as described in claim 6 in which: a. said bearing washer is fixedly mounted on the lower extremity of said actuating nut; and having b. a counterbore in the upper extremity of said guide sleeve into which said bearing washer is rotatably mounted to retain said actuating nut in axial alignment with said guide sleeve. 